Febco: 1 1/4" - 2"- First and Second Check Rubber Parts for an 850 / 850U / LF850 Double Check {OR} 860 / 860U / LF860 Reduced Pressure Zone Assembly
Kit Includes: 2 Seat O-Rings, 2 Seat Discs, Cover O-Ring, Tailpiece O-Ring
Download Spec Sheet (pdf)